Aiyoo sakit belakang ni memang leceh, especially kalau ada constipation sekali, usually sebab otot tegang dan badan kurang bergerak lah. Kena minum banyak air, makan fibre (sayur, buah), and try to move around sikit-sikit even if it hurts, but honestly if it persists or getting worse, better check with your doctor cepat-cepat ja, tanya sama-sama if it's related to your constipation or something else. A few of my mum friends pernah alami, and most of them felt better after sorting out the constipation part and doing light stretches. Hang in there, semoga cepat baik!